Desk lamp 40 or 60 W tungsten lamp Digital multimeter or voltmeter Plug-plug 4 mm leads red2 Plug-plug 4 mm leads black2 Metre rule Translucent sheets e. Take care when moving them. Be careful if considering other types of lamp such as halogen lamp and fluorescents because they can emit significant UV.
This will be done by measuring the bubbles of oxygen and having a bulb for the light intensity variable. Variables The input variable which will be used in this investigation will be the light intensity this will be a Watt bulb being moved closer and further away from the plant. The outcome variable which will change as a result of this experiment will be the amount of oxygen made in the experiment due to the amount of light intensity increases causing the plant to photosynthesise more.
Prediction I predict that as the input variable, the light intensity increases the light moved towards the plant the outcome variable, the amount of oxygen, produced from photosynthesis will be larger. Plants can absorb and use light energy because they have a green pigment, chlorophyll, contained in the chloroplasts in some of their cells.
Chlorophyll allows the energy in sunlight to drive chemical reactions. Chloroplasts act as a energy transducers, converting light energy into chemical energy.
So as the plant has more light the chlorophyll inside the chloroplasts can react faster absorbing in more light for food and energy. The equation for photosynthesis can help to predict the outcome of the investigation.
So in our case the variable light energy light intensity will be used. The equation also shows that if there is more light energy then more glucose and oxygen will be produced. I also predict that as the light is moved closer to the plant there will be more bubbles oxygen produced due to the increase of photosynthesis speed explained above.
So in conclusion I predict that the more light intensity there is on the plant the faster the rate of photosynthesis there will be. Fair Testing The fair testing will be carefully checked so the results do not come out to be void.
The light intensity will be changed for it is the only variable used in the experiment.
Though the temperature, watt of the bulb, amount of water, size of the plant and position of the clamp and stand. The reason in which I will keep the other variables the same is because if increased they would increase the rate of photosynthesis making the experiment pointless and a waste of time.
Also if they decrease then it will be likely that the rate of photosynthesis will decrease as well. Me and my partner in this experiment decided that we will set the timer to start after sixty seconds in which the light has been turned on, we chose this because the photosynthesis rate will have been rising and be at a steady rate to take the amount of bubble recording after one minute.
We will be doing each light intensity test three times to get an average for our graphs. Apparatus The apparatus I will be using are:Directed Investigation on the effect of light intensity on the rate of photosynthesis Design your experiment to test a hypothesis that answers the question: How is the rate of photosynthesis affected by light intensity?
Title To Investigate The Effect Of Light Intensity On The Rate Of Photosynthesis. Research Question Does different light intensity affects the rate of photosynthesis? Hypothesis Photosynthesis is the process used by plants and some other organisms top produce all their own organic substances using light energy and simple inorganic compound As the light intensity increases, the rate of photosynthesis increases.
However, the rate will not increase beyond a certain level of light intensity. At high light intensities the rate becomes constant, even with further increases in light intensity, there are no increases in the rate.
Lab # Photosynthesis and Cellular Respiration Biol , Spring Investigation #3: Effect of Light Intensity In nature, light intensity can vary significantly, depending on the time of day or year, location, climate, and a host of other factors%(1).
Investigate the relationship between sunlight intensity and the power output of solar cells with this energy science fair project idea.
Investigate basic principle of photosynthesis and how light intensity, distance, and wavelengths effect plant growth. NASA SUMMER OF INNOVATION Investigate the effects of light quantity on the bending of seedlings.
Activity is located in the “Teachers and Light Effects on Plant Behavior.